JPH11167019A - Production of color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for producing color filters which have high durability, has less color nonuniformity, has high display quality, may be produced with high productivity in shorter stages and may be reduced in cost. SOLUTION: (A) An exposure stage by scanning of laser beams for irradiating the surface of an intermediate transfer body 14 provided with an IR absorption layer 11 consisting of IR absorbent dyestuffs and a binder resin and a delayed tack adhesive layer 13 contg. a binder resin, a plasticizer and a tacky adhesive on a flexible substrate 10 with heat rays to the shape of the image to be formed, (2) a stage for bringing the delayed tack adhesive layer 13 into contact with the transfer layer 18 of transfer foil 20 provided with a transfer layer 18 consisting of coloring agents and the binder resin on a base after the irradiation with the heat rays and (3) a stage for peeling the transfer foil 20 from the intermediate transfer body 14 after the tight adhesion. These stages are repeated plural times with the transfer foil of different colors to form the colored pattern images of the prescribed shapes of the plural colors. The body to be transferred which is formed by providing the surface of a transparent substrate with an adhesive layer of the binder resin is then brought into tight contact with the colored pattern images under pressurization and is stripped, by which the colored patterns of the prescribed shapes of plural colors are transferred and formed on the body to be transferred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color separation filter used for a color liquid crystal display (LCD) or a color solid-state image pickup device (CCD) for a color video camera, etc. The present invention relates to a method of manufacturing on a substrate.

[0002]

2. Description of the Related Art A color filter for color separation is used for a color liquid crystal display device such as a display for a computer, a color television, a color monitor, or a color video camera. Among these, various methods have been proposed as a method of manufacturing a color filter for a color liquid crystal display device.
Representative methods include (1) dyeing, (2) pigment dispersion, (3) electrodeposition, and (4) printing.

[0003] The dyeing method is to form an easily dyeable transparent layer and a photosensitive resin layer on a transparent substrate, form the photosensitive resin layer in a desired pattern by photolithography, and then dye. A method of forming a color filter by repeating the steps of patterning and dyeing the photosensitive resin layer for each color, and applying the photosensitive resin layer for the next color for each color. It is. It has a feature that a color filter with good color purity can be obtained by appropriately selecting a dye.

In the pigment dispersion method, a process of applying a photosensitive resin in which a pigment or a dye is dispersed on a transparent substrate and then forming a desired pattern by a photolithography technique is repeated for each color. This is a method of manufacturing a color filter. When a pigment is used, the color filter is characterized by having a high durability such as heat resistance and light resistance. The electrodeposition method is a method in which a transparent conductor layer is laminated on a transparent substrate by a method such as a vacuum deposition method, and formed into a desired pattern using a photolithography technique. This is a method of producing a color filter by repeating a process of forming a desired colored resin pattern for each color by immersing the resin in an electrodeposition coating solvent in which a polymer resin containing a dye or a dye is dispersed. The printing method uses a method such as lithographic offset printing, intaglio offset printing, screen printing, etc., and deposits ink on a printing plate in which ink receiving / non-receiving properties are formed in a desired pattern. This is a method of manufacturing a color filter by repeating the process of transferring a color ink to a transparent substrate once and then forming a desired pattern by transferring the color ink to a blanket for each color.

[0005]

However, none of the above-mentioned methods has always been satisfactory as a method for manufacturing a color filter. This is because, for example, in the case of the dyeing method and the pigment dispersing method, although high resolution and stability are obtained by the photolithography technique, the coating, drying, pattern exposure, development, dyeing ( However, dyeing is necessary in the case of the dyeing method.) Various steps of washing, drying, and baking are necessary. Further, in order to make a color filter, the above steps need to be repeated for the required number of colors. Due to the large number and length, the number of steps to be managed increases, which is not only complicated, but also increases the chances of causing defects during the process, and in addition, the problem of taking time to move between processes is liable to occur. . In the spin coater used in the coating process,
Only a few percent of the dropped colored photosensitive solution remains on the transparent substrate, and the remainder must be discarded or need to be reused by collection, and waste liquid treatment is required in the next wet development And many factors that lead to increased costs. In addition, transparent substrates are expected to be implemented as a cost reduction method in the future.
It is thought that it becomes difficult to form a uniform coating surface by spin coater.

In the case of the electrodeposition method, a transparent conductor layer (generally, ITO, etc.) is formed on a transparent substrate.
Oxide (abbreviation of Oxide) is formed by vacuum evaporation, etc., finely processed by photolithography technology according to each color pattern, and then a different conductive layer pattern for each color is energized to deposit a colored layer. The film thickness can be controlled by the applied voltage and time, and the composition of the electrodeposition solution combining the pigment and the thermosetting resin can be selected. Increasing the bathing has the advantage that the size of the transparent substrate can be easily increased. However, since the transparent conductive layer needs to be connected to each other in a pattern in which the same color is electrodeposited and to be insulated in a pattern between different colors, the shape and arrangement of the pixels are likely to be restricted. Alternatively, there is a problem that it is difficult to improve the productivity due to the demand for advanced patterning technology.

[0007] Then, in the printing method, once a printing plate of any type is manufactured, a photolithography process such as applying a photosensitive resin for each color to a transparent substrate and exposing / developing, as in other methods, is performed as in other methods. Is not required, so it has advantages such as a short and simple manufacturing process, low cost and high productivity, but on the other hand, the shape of the colored pattern (plane, cross section)
In addition, there are problems unique to the printing method that it is difficult to maintain uniform and high positional accuracy and to control the printing thickness to be constant and to prevent bleeding and color unevenness from occurring.

There is also a transfer method in which a transfer filter for each color is transferred to an adhesive layer patterned by a printing method or the like to produce a color filter. However, patterning by printing has the same problems of accuracy and resolution as described above. And it is difficult to maintain the transfer position of the transfer foil and the print position of the next color adhesive layer in a good manner, because the higher the definition pattern, the more difficult it becomes. Tended to spoil.

As another example of such a system, Japanese Patent Application No.
No. 297595 and Japanese Patent Application No. 6-297597 include a delayed tack adhesive which generates tack when heated, and an infrared absorbing layer for converting infrared light to heat and heating the delayed tack adhesive layer. Performing pattern exposure on the transfer receiving body provided on a transparent substrate, the step of peeling after the transfer foil containing a colorant is adhered, the color filter manufacturing method by repeating the required number of colors is described. I have. However, in these methods, it is difficult to improve the sensitivity because the heat generated in the infrared absorbing layer is conducted to the glass substrate and escapes, and there are few infrared absorbing dyes for the infrared absorbing layer that do not absorb visible light. There was a problem that it was difficult to suppress unnecessary coloring on the color filter.

The present invention has been made in view of the above-mentioned problems, that is, it has high durability, has little color unevenness, has high display quality, can be manufactured in a short process, has high productivity, and has a high cost. An object of the present invention is to provide a method of manufacturing a color filter that can be downed.

[0011]

In order to solve the above-mentioned problems, the present invention provides the following means. First, the invention according to claim 1 provides a delayed tack comprising, on a flexible substrate, an infrared absorbing layer made of an infrared absorbing dye and a binder resin, and a binder resin, a plasticizer and an adhesive. A heat ray exposure step by scanning a laser beam controlled to irradiate heat rays based on data of an image shape to be formed on the intermediate transfer body constituted by providing an adhesive layer, and after the heat ray irradiation, the intermediate transfer body A step of bringing a delayed tack pressure-sensitive adhesive layer into close contact with a transfer layer of a transfer foil having a structure in which a transfer layer made of a colorant and a binder resin is provided on a support; and A peeling step of peeling from the body, forming a colored pattern image of a predetermined shape of a plurality of colors by repeating these series of steps a plurality of times using transfer foils of different colors, and then, from a binder resin on a transparent substrate Contact A color filter, wherein a color pattern having a predetermined shape of a plurality of colors is transferred and formed on the transfer object by peeling off the transfer object provided with the layer after pressing and contacting the color pattern image. It is a manufacturing method of. Here, the flexible substrate refers to the heating and heating of the delayed tack adhesive layer.
Any plastic sheet may be used as long as it has the heat resistance necessary for generating adhesive strength. In addition, by selecting a material having a low thermal conductivity, an excellent effect that heat generated in the infrared absorbing layer is efficiently used in the delayed tack adhesive layer can be obtained.

The invention according to claim 2 is based on claim 1.
Assuming the method of manufacturing a color filter according to the invention described above, when transferring a colored pattern image of a plurality of colors from the intermediate transfer body to the transfer receiving body, the infrared absorbing layer and the delayed tack adhesive layer of the intermediate transfer body , And both the colored pattern having a predetermined shape of a plurality of colors and the delayed tack adhesive layer are transferred onto the transfer object.

According to a third aspect of the present invention, based on the method for manufacturing a color filter according to the first aspect of the present invention, a release layer is provided between the infrared absorbing layer and the delayed tack adhesive layer of the intermediate transfer member. When transferring a plurality of color pattern images from the intermediate transfer body to the transfer receiving body, when being separated from between the infrared absorbing layer and the delayed tack adhesive layer of the intermediate transfer body, I have. Here, the magnitude of the adhesion between the release layer and the infrared absorbing layer and the compatibility with the delayed tack adhesive layer on the material combination are determined. Therefore, at the time of transfer, depending on the material combination of the infrared absorbing layer, the release layer and the delayed tack adhesive layer, the release layer may remain on the infrared absorbing layer, or the release layer may remain on the delayed tack adhesive layer side. There is also.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, FIG. 1A shows an example of an intermediate transfer member applied when performing the color filter manufacturing method according to the present invention. That is, the main part of the intermediate transfer body 14 is composed of the flexible substrate 10, the infrared absorption layer 11, the release layer 12, and the delayed tack adhesive layer 13 sequentially provided on the substrate 10. I have. The substrate 10 is made of a material such as a plastic film which is suitable as an intermediate transfer member, and the delayed tack adhesive layer 13 develops an adhesive strength of an appropriate strength by heating, but does not generate or generate adhesive strength in an unheated state. Those having characteristics that are very small are applied. The infrared absorbing layer 11 heats the delayed tack adhesive layer 13 by absorbing infrared light generated from a semiconductor laser, a YAG laser, or the like and converting it into heat. The release layer 12 is provided with a delayed tack adhesive layer 13
When transferring the adhesive layer 13 and the infrared ray absorbing layer 11 when transferring the pattern portion 28 of the transfer foil and the transfer foil, the composition and configuration of the delayed tack adhesive layer 13 and the infrared ray absorbing layer 11 are easily determined. It can be made unnecessary by selection, but it is desirable to have it in order to expand the range of material selection.

In order to form a color filter on the intermediate transfer member 14, first, as shown in FIG. 1B, heat rays are directed upward or downward in a stripe or mosaic image pattern. The laser beam oscillation and the scanning position of the light beam by the scanner are coordinated and controlled so as to irradiate the infrared light beam from the infrared absorbing layer 11.
Is generated according to the shape of the image, so that the delayed tack adhesive layer 13 is formed with an adhesive portion 22 having an adhesive force according to the image shape and a non-adhesive portion 24 which is a non-heated portion.

Next, as shown in FIG.
The transfer foil 20 having the transfer layer 18 provided thereon and the intermediate transfer member 14 are combined with the delayed tack adhesive layer 13 and the transfer layer 18.
1 (d), the support 16 and the transfer-receiving body 14 are peeled off (peeling-off step), so that the delayed tack adhesive layer 13 is removed. Since the portion 30 of the transfer layer 18 corresponding to the adhesive portion 24 is peeled off while being attached to the support 16, the portion 30 of the transfer layer 18 corresponding to the adhesive portion 22 is not transferred to the delayed tack adhesive layer 13. It is transferred to the delayed tack adhesive layer 13 without peeling from the body 16. By the above-described operation, the adhesive portion 22 appears as a striped or mosaic-like latent image to be formed, so that one color of the color filter is formed on the intermediate transfer member 14 by the portion 28 transferred from the transfer layer 18. Is formed.

The support 16 of the transfer foil 20 is a film made of polyethylene terephthalate or the like having appropriate flexibility and adhesion to the transfer layer 18, and the transfer layer 18 is made of a colorant such as a pigment and a pigment. It is made of a binder resin as a good dispersion medium and satisfies the required properties as a color filter, such as smoothness, durability such as heat resistance and light resistance, and optical characteristics. The composition is such that the adhesive strength between the delayed tack pressure-sensitive adhesive layer 13 and the support 16 at the time of formation is satisfied, and the required breaking force characteristics in the transfer layer are satisfied.

[0018] Here, the transfer F ₁ the adhesion force of the support member 16 and the transfer layer 18 of the foil 20, transfer layer 18 and Delayed adhesion F ₂ of the non-adhesive portion 24 of the tack adhesive layer 13, transfer layer 1
Assuming that the adhesive force F ₂ ′ between the adhesive layer 8 and the adhesive portion 22 of the delayed tack adhesive layer 13 and the breaking strength of the transfer layer 18 are F ₃ ,
The following relationship must be satisfied. F ₂ <F ₂ + F ₃ <F ₁ <F ₁ + F ₃ <F ₂ '

The pattern exposure according to the image shape by the infrared laser beam scanning irradiation on the infrared absorption layer 12 may be performed from above or below the intermediate transfer member 14, and the infrared laser beam exposure is performed from above. In this case, the delayed tack pressure-sensitive adhesive layer 13 needs to be transparent to infrared rays, and when it is operated from below, the substrate 10 needs to be transparent to infrared rays. Exposure may be performed from the side where required infrared transmittance can be secured.

FIG. 2 shows an example of a transfer member applied when the method for manufacturing a color filter according to the present invention is carried out. That is, the transfer target body 5 has a configuration in which the adhesive layer 2 made of the binder resin is provided on the transparent substrate 1, and the transfer layer 18 formed on the intermediate transfer body 14 is transferred.
Is transferred to the delayed tack adhesive layer 13 to form a final color filter. Here, the transparent substrate 1 is made of a material such as glass having a suitable property as a color filter substrate, and the adhesive layer 2 is made of a material having durability such as transparency, flatness, heat resistance, light resistance and the like which are necessary characteristics for a color filter. In addition to the properties and the optical properties, the composition has a sufficient adhesive force between the transfer layer 18 and the delayed tack adhesive layer 13 during image transfer, an adhesive force with the transparent substrate 1, and a cohesive force in the adhesive layer. Things.

Here, the adhesive force between the adhesive layer 2 and the remaining portion 28 of the transfer layer 18 is F ₄ , the adhesive force F ₅ between the adhesive layer 2 and the non-adhesive portion 24 of the delayed tack adhesive layer 13 is F ₄ ,
8, the adhesive force F ₂ ′ between the delayed tack adhesive layer 13 and the adhesive portion 22 of the delayed tack adhesive layer 13, the adhesive force F ₆ between the delayed tack adhesive layer 13 and the release layer 12, the release layer 12 and the infrared absorbing layer 11. the adhesion force F _7, and when the adhesion strength F ₇ 'of the delayed tack adhesive layer 13 and the infrared absorbing layer 11, it is necessary to satisfy the following relationship. F ₆ <F ₇ <F ₂ ′ ≦ F ₄ ≦ F ₅ Further, when F ₇ ≒ F ₇ ′, the release layer 12 is not provided, and the delayed tack adhesive layer 13 is provided on the infrared absorption layer 11. Can be provided directly.

In order to manufacture a color filter by the above-described image forming method, first, as shown in FIG. 3A, a black matrix 38 is formed by coating a photosensitive resin in which a black pigment is dispersed by a photolithography method with a required pattern. A chromium film formed by vapor deposition or the like, or a method of forming a chromium film in a pattern by a photolithography method, and the like. Prepare a transcript.

The intermediate transfer member is, as shown in FIG.
On a substrate 10, an infrared absorbing layer 11 for converting irradiated infrared rays to heat is applied and formed, and then a release layer 12 is applied and formed thereon. The agent layer 13 is formed by coating.

Next, the intermediate transfer member 14 is subjected to infrared laser beam scanning irradiation in accordance with the red pattern of the color filter, and the infrared absorbing layer 12 is heated in accordance with the pattern to form an adhesive portion on the delayed tack adhesive layer 13 as a latent image as a latent image. After the formation of the red transfer layer 1 on the support 16 as shown in FIG.
When the transfer foil 20 is peeled off from the intermediate transfer member 14 as shown in FIG. 3D, only the adhesive portion 22 formed as a latent image is formed. The red transfer layer 18 is transferred to form a red portion pattern 32r.

Further, other portions on the delayed tack adhesive layer 13 of the intermediate transfer body 14 on which the red portion pattern 32r is formed are irradiated with infrared laser beam scanning in the same green pattern as described above, and then the green transfer foil is formed. Then, the green transfer layer 18 is transferred to form a green portion pattern 32g as shown in FIG. Subsequently, the remaining portion on the delayed tack adhesive layer 13 of the intermediate transfer body 14 on which the red portion pattern 32r and the green portion pattern 32g are formed is irradiated with the infrared laser beam according to the blue pattern in the same manner as described above. After that, the blue transfer foil 20 is adhered and then peeled off, and the blue transfer layer 18 is transferred.
A blue portion pattern 32b as shown in FIG.

Through such a series of steps, red, green,
The delayed tack adhesive layer 13 of the intermediate transfer body having three blue colored patterns 32r, 32g and 32b formed at predetermined positions, and the three colored patterns and the transparent substrate 1 on which the black stripes are formed Then, the transfer member 5 having the colored pattern as the color filter and the delayed tack pressure-sensitive adhesive layer laminated thereon can be manufactured by bringing the adhesive layer 2 into close contact with the adhesive layer 2. In addition, the black stripe 38 formed on the transparent substrate 1 before the formation of the coloring pattern of each color in the above-described process is transferred by the above method in consideration of characteristics required for the color filter, cost, and the like. A black photosensitive resin may be formed on the colored pattern of each color or on the transferred delayed tack adhesive layer 13 by a photolithography method.

Next, each material constituting the intermediate transfer member and the transfer foil applied in the present invention will be described with reference to specific examples.

First, the transparent substrate of the material to be transferred should have good dimensional stability and be resistant to exposure to heat rays during image formation and heating during the color filter manufacturing process. Although not particularly limited, a glass substrate generally used as a substrate for a color filter,
Other heat-resistant plastic sheets, such as polyethylene terephthalate and polyethylene naphthalate,
Polyamide, polysulfan, polyethersulfan, polyimide and the like can be applied, but they are used in consideration of cost and characteristics.

The adhesive layer made of the binder resin of the object to be transferred has good adhesion to the transfer layer of the transfer foil and the delayed tack adhesive layer, and has resistance to heating during the color filter manufacturing process. There is no particular limitation as long as it matches the characteristics as a color filter. Some examples include polyacrylate, polyvinyl acetate, polyacrylate-vinyl acetate, polystyrene-acrylate, polystyrene-butadiene, polyethylene-vinyl acetate, polyvinyl chloride, polyethylene-
Vinyl chloride, polyethylene-acrylate, polyethylene-acrylic acid, epoxy resin, melamine resin,
Examples thereof include diallyl phthalate resin, polyamide resin, and polyimide resin.

Next, the substrate of the constituent material of the intermediate transfer member is not particularly limited as long as it has flexibility, good dimensional stability, and is resistant to heat ray exposure during image formation. Not a real thing. Plastic sheets that can achieve both strength and flexibility, such as polyethylene terephthalate, polyethylene naphthalate, polyamide, polysulfan, polyethersulfan, or polyimide can be applied, but each property such as cost and heat conduction properties Considering the above, it is good to select appropriately. When performing heat ray exposure during image formation from the substrate side, a plastic sheet transparent to the exposure wavelength is selected.

The delayed tack adhesive used for the delayed tack adhesive layer formed on the intermediate transfer member may be an aqueous emulsion or an organic solvent solution, or a mixture of a binder resin, a solid plasticizer, and a tackifier. What is configured applies. It is desirable that the ratio of the binder resin, the solid plasticizer, and the tackifier is in the range of 20 to 5: 20 to 10: 10 to 3 (parts by weight). If necessary, a dispersing aid, an antifoaming agent, a thickener and the like may be added. It is also possible to use and use a hot melt adhesive which is a thermoplastic polymer and does not contain any solvent or water.

Here, the binder resin is selected from those which are solid at room temperature and have the properties of a thermoplastic resin, and which have a glass transition temperature suitable for the heat-sensitive temperature set as a delayed tack adhesive. And acts as a component that imparts adhesive strength. Examples include polyacrylate, polyvinyl acetate, polyacrylate-vinyl acetate, polystyrene-acrylate, polystyrene-butadiene, polyethylene-vinyl acetate, polyvinyl chloride, polyethylene-vinyl chloride, polyethylene-acrylate. , Polyethylene-acrylic acid, polybutadiene,
Polyurethane, natural rubber, synthetic rubber, etc. as a single unit,
Alternatively, they are used as a mixture.

A solid plasticizer is a solid plasticizer that is solid at normal temperature but melts when heated to a temperature higher than the melting point inherent to the material, and acts to develop tackiness by swelling and dissolving the binder resin and tackifier. It is. As examples of the solid plasticizer, phthalates, benzoates, and sulfonamides are mainly used. Examples include diphenyl phthalate, diethylhexyl phthalate, dihydroabiethyl phthalate, dimethyl isophthalate, sucrose benzoate,
Examples include ethylene glycol dibenzoate, trimethylolethane tribenzoate, glyceride tribenzoate, pentaerythritol tetrabenzoate, sucrose octaacetate, tricyclohexyl citrate, and N-cyclohexyl-p-trisulfonamide.

The tackifier is a component for enhancing the tackiness of a delayed tack pressure-sensitive adhesive which has been activated by heating to exhibit tackiness. Examples thereof include terpene resins such as terpene resins and terpene phenol resins. Rosin, rosin and rosin derivatives (polymerized rosin, hydrogenated rosin, their esters with glycerin, pentaerythritol, etc., fatty acid dimer, etc.), aliphatic petroleum resins, aromatic petroleum resins and alicycles Petroleum resins such as group petroleum resins, cumarone-indene resins, phenolic resins, terpene-phenol resins, and xylene resins.

The hot melt adhesive comprises a resin component, a wax, a plasticizer, a tackifier, an antioxidant, a heat stabilizer, a filler and the like. Examples of the resin component include polyethylene, polyamide, polyvinyl butyral, polyvinyl acetate, and ethylene-vinyl acetate copolymer. Examples of the wax include petroleum-based (paraffin wax, etc.) and vegetable-based (wood wax, white wax, Beeswax)
Examples of the plasticizer include phthalate esters such as diphenyl phthalate, dihexyl phthalate, and dicyclohexyl phthalate, phosphate esters, paraffin chloride, and petroleum plasticizers. Tackifiers include butyral resin, polyisobutylene, acrylonitrile resin and petroleum resin, and antioxidants include dilauryl thiodipropionate, 2,6-t-cresol, p-octylphenol, benzoic acid Soda, calcium stearate, etc., and as fillers, talc, clay, calcium carbonate, barium carbonate,
A baryta can be used.

It is essential to adjust the component composition and mixing ratio of the above-mentioned delayed tack adhesive so as to be compatible with the transfer foil characteristics, in order to achieve the image characteristics required for the production of a color filter. It is necessary to determine the composition and ratio of each of the above-described components so as to satisfy the resistance to the color filter manufacturing process and the durability characteristics as a color filter.

The release layer is a binder resin having a releasability from the infrared absorbing layer, but a predetermined colored pattern forming step as an intermediate transfer member, that is, an image pattern exposure with an infrared laser beam and a delayed tack adhesive. In the transfer foil transfer to the layer, the film is not peeled off from the infrared absorbing layer and the delayed tack adhesive layer, but needs to have the property of being peeled off by being transferred to the adhesive layer of the transferred body. For this, it is possible to use by selecting from commonly used thermoplastic resins and thermosetting resins, etc., but it is necessary to match the binder resin used for the infrared absorption layer with the delayed tack adhesive resin. It is important to consider and choose. In addition, when performing heat ray exposure during image formation from the substrate side, it is necessary to select a binder resin having high transparency with respect to the exposure wavelength. Examples include alkyd resin, vinyl resin, phenol resin, epoxy resin, acrylic resin, urethane resin, polyether resin, butyral resin, silicon resin, diallyl phthalate resin, polyamide resin, acetate resin, and cellulose derivatives such as nitrocellulose. Species or a mixture of two or the like can be mentioned. These may be dissolved and applied by a solvent alone or in combination of two or more as necessary.

The infrared-absorbing layer has a structure in which an infrared-absorbing dye having light absorption in a laser beam for exposure is dissolved and applied to a thermoplastic resin or a thermosetting resin, and absorbs the laser beam to convert it into heat. To heat the delayed tack layer. Known carbon black as an infrared absorber,
Examples include organic metal complexes such as phthalocyanine, azo, and thioamide, and organic compounds such as diimonium, anthraquinone, polymethine, azurenium, squarylium, and thiopyrylium. In the present invention, the amount of the infrared absorbing agent contained in the infrared absorbing layer is preferably 0.01 to 50% by weight, and 0.1 to 50% by weight. More preferable solubility characteristics and optical absorption characteristics can be obtained at about 1 to 30% by weight, but it may be determined in consideration of the thickness of the infrared absorption layer, laser light intensity, heat conversion ability, and the like.

As the thermoplastic resin or thermosetting resin for dissolving and mixing the infrared absorbing dye, for example, epoxy resin, acetate resin, melamine resin, benzoguanamine resin, diallyl phthalate resin, polyamide resin, polyimide resin and the like can be used. It is possible. From these resins, those having good compatibility with the infrared absorbing dye to be used may be selected and used.

The transfer foil is obtained by forming a transfer layer made of a colorant and a binder resin on a support, and a flexible resin film, resin sheet or the like is used for the support. As the resin, it is possible to use, for example, polyester, vinyl chloride, polycarbonate, polyethylene, polypropylene, polyamide, polystyrene, ethylene-vinyl acetate copolymer, etc., which are on the market as films and sheets. The thickness of the support is 1
Those having a thickness of 0 μm to 100 μm are preferable, and those having a thickness of about 20 μm to 75 μm are particularly desirable. When the thickness is less than 10 μm, the strength of the support is insufficient compared with the adhesive strength of the delayed tack layer in the peeling step of peeling the transfer foil from the transfer-receiving body. In addition to the difficulty in performing image transfer, there is a tendency that handleability in other heat ray irradiation steps and adhesion steps is deteriorated. Also,
When the thickness is more than 100 μm, the bending strength of the support becomes too strong, so that it is difficult to increase the peel angle.

The transfer layer is made of, for example, an acrylic resin and an acrylic copolymer, a styrene resin and a styrene copolymer, a cellulose derivative, a rosin ester resin, a polyvinyl acetate resin, a vinyl chloride resin, and a vinyl chloride vinyl acetate copolymer. A mixture in which one or more resins such as coalesce, coumarone resin, vinyl ketone resin, butyral resin, polyurethane resin, polyester resin, and gum arabic are mixed and dispersed with a coloring agent such as a pigment is applied. The transfer layer can be formed on the support by a gravure coater, gravure offset coater, gravure reverse coater, bar coater, lip coater, knife coater, or the like.

The thickness of the transfer layer is preferably from 0.1 to 30 μm from the viewpoint of transfer characteristics, optical characteristics, coating suitability, and the like.
In particular, the range of 0.1 to 10 μm is desirable. Further, in order to enhance the releasability between the transfer layer of the transfer foil and the support, a release layer may be interposed between the support and the transfer layer. As the resin used for the release layer, alkyd resin, vinyl resin, phenol resin, epoxy resin, acrylic resin, urethane resin,
Examples thereof include one or a mixture of two or more cellulose derivatives such as polyether resin, butyral resin, silicon resin, and nitrocellulose.

The coloring agent in the transfer layer can be broadly classified into inorganic pigments, organic pigments, and organic dyes. Examples of inorganic pigments include carbon black, Prussian blue, cadmium sulfide, iron oxide, and lead, zinc, barium and calcium chromates, and examples of organic pigments include azo-based, thioindigo-based pigments, and the like. Examples include pigments such as anthraquinone-based, anthantrone-based, triphenedioxazine-based, and phthalocyanine and its derivatives, such as phthalocyanine-based and quinacridone-based pigments. Examples of organic dyes include acid dyes, basic dyes, direct dyes, disperse dyes, oil-soluble dyes,
And metal-containing oil-soluble dyes. These pigments and dyes may be appropriately selected from various types available on the market and used. For example, “Dye Handbook” (edited by The Society of Synthetic Organic Chemistry, published in 1970) and Pigment Handbook "(edited by the Japan Pigment Technical Association, published in 1976) and the like can also be used. These colorants may be used alone or as a mixture of two or more as needed. If necessary, a known suitable dispersant may be used, or the surface of the particles may be modified, and then uniformly mixed in the resin using a known disperser. The amount of the coloring agent used is preferably 0.1 to ²⁰ g per 1 m ² of the support, and if it is 0.2 to 5 g, more preferable coloring properties, optical properties, transfer properties and the like can be imparted.

In the case of a color filter, a light-shielding black matrix pattern such as a black color is provided so as to overlap with each colored pattern, that is, a portion where no colored pattern of each of RGB (red, green, blue) is formed and a boundary portion. Using a method other than transfer to the delayed tack adhesive layer before forming the colored pattern of each color or the adhesive layer before transferring the colored pattern, for example, vacuum deposition of a metal film, or a photosensitive resin containing a black pigment using a photolithography technique. By forming the color filter, the color reproduction characteristics of the color filter are improved, and even when the transfer formation position of each color coloring pattern is slightly shifted, the color filter has a uniform shape of the color pattern and has little variation in the color reproduction characteristics. Can be manufactured.

[0045]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific embodiments.

In the examples and the like, parts are parts by weight,
% Represents% by weight.

Example 1 The following composition was applied to a cleaned 1 mm-thick glass substrate surface using an applicator.
It was dried at 00 ° C. to form an adhesive layer, and a transfer-receiving body was produced. After drying, the film thickness was about 5 μm. (Adhesive layer composition) ・ Diallyl phthalate resin (Dap A: Dap A): 15 parts by weight ・ Polyester resin (Toyobo: Byron 300): 5 parts by weight ・ Toluene: 40 parts by weight ・ 2-butanone: 40 parts by weight

Next, an intermediate transfer member having a thickness of 100 μm
The following composition was applied to the surface of the polyethylene terephthalate film of Example 1 with an applicator and dried at 100 ° C. to form a release layer. After drying, the film thickness was about 1 μm. (Composition of release layer) ・ Vinyl chloride vinyl acetate resin (manufactured by Union Carbide Co., Ltd .: VAGH) 20 parts by weight ・ Toluene 40 parts by weight ・ 2-butanone 40 parts by weight

Next, the following composition was applied on the release layer by a spin coater, and dried at 100 ° C. to form an infrared absorbing layer. (Infrared absorbing layer composition) Polyester resin (manufactured by Toyobo Co .: Byron # 2000) ... 10 parts by weight Isocyanate (manufactured by Asahi Kasei Corporation: Duranate 24A100) 0.1 parts by weight Infrared absorbing dye (manufactured by Nippon Kayaku Co., Ltd .: CY) -9) 0.2 parts by weight Toluene 45 parts by weight 2-butanone 45 parts by weight

(Delayed tack adhesive layer) Dicyclohexyl phthalate: 50 parts by weight Polyvinyl alcohol: 3 parts by weight Nonionic activator: 3 parts by weight Water: 44 parts by weight The following materials were mixed and stirred so that the solid content concentration became 50%, to produce an aqueous coating solution of a delayed tack adhesive. The above dispersion liquid: 15 parts by weight Acrylic resin aqueous emulsion (solid part): 10 parts by weight Rosin ester aqueous emulsion (solid part): 5 parts by weight The resulting glass substrate was coated with an applicator so as to have a dry film thickness of 10 μm, and then dried in an oven at 40 ° C. to prepare a transfer target.

The transfer foil was prepared by using a polyester film having a thickness of 25 μm as a support and dispersing a coating solution having the following composition on the surface thereof by a sand mill to obtain a transfer layer coating solution.・ Pigment 1 part by weight ・ Saturated polyester (Toyobo: Byron 103) 2 parts by weight ・ Acrylic resin (Mitsubishi Rayon: BR-80) 4 parts by weight ・ Toluene 15 parts by weight ・ 2-butanone 15 parts by weight The liquid was applied with a wire bar so that the dry film thickness became 1.5 μm, and dried to produce transfer foils of each color.

The following pigments were used for each color. (Red pigment) ・ Rionogen Red GD (manufactured by Toyo Ink Mfg. Co .: CI Pigment Red 168) ... 70 parts by weight ・ Rionogen Orange (manufactured by Toyo Ink Mfg. Co .: CI Pigment Orange 36) ... 30 wt. Part (green pigment) ・ Rionogen Green 2YS (manufactured by Toyo Ink Manufacturing Co .: CI Pigment Green 36) ... 75 parts by weight ・ Rionogen Yellow (manufactured by Toyo Ink Manufacturing Co .: CI Pigment Yellow 154) ... 25 Parts by weight (blue pigment) ・ Rionogen Blue ES (manufactured by Toyo Ink Mfg. Co .: CI Pigment Blue 156) ... 80 parts by weight ・ Rionogen Violet RL (manufactured by Toyo Ink Mfg. Co .: CI Pigment Violet 23) ... 20 parts by weight

(Image formation) Semiconductor laser light is condensed from the back side of the intermediate transfer member by an optical system so that the beam diameter on the surface of the infrared absorbing layer becomes about 100 μm of the stripe width of the color filter, and the transfer object is formed. Irradiation was performed while moving.
The laser beam irradiation and the transfer of the object to be transferred are performed using a semiconductor laser (SLU304XR, output 1 W, manufactured by Sony Corporation) and a laser driver (GSB353, manufactured by Global Electronics Industry Co., Ltd.).
0) and XY stage (Chuo Seiki: PS120X
Y and controller CAT-II + driver SD-P)
The laser irradiation and the XY stage movement were synchronized by a control device mainly using a personal computer, thereby irradiating a laser beam so as to form a predetermined pattern. Next, after the green transfer foil is brought into close contact with the intermediate transfer body, the transfer foil is pressed between the pneumatic rollers and the transfer foil is pressed.
By peeling off so as to approach 0 ° peeling, a green stripe pattern was formed on the delayed tack layer of the intermediate transfer member. The required irradiation energy at this time is about 2J
/ Cm ² .

Further, the same laser beam irradiation and foil transfer were performed on the red transfer foil and the blue transfer foil, thereby forming a stripe pattern of three colors on the delayed tack layer of the intermediate transfer body.

The delayed tack adhesive layer side of the intermediate transfer member on which the three-color stripe pattern was formed was brought into close contact with the adhesive layer of the transfer member, and pressure was applied by the pressing roller used for transfer of the transfer foil. By subsequently peeling off the intermediate transfer member, a three-color stripe pattern and a delayed tack layer were successfully transferred / formed on the transfer target member. Thereafter, post baking was performed at 200 ° C. to produce a color filter. At this time, the produced color filter was transparent and had good display quality because it was separated from the coloring by the infrared absorbing layer (this dye was blue).

[Example 2] In the same manner as in Example 1, an adhesive layer having the following composition was applied to the surface of a glass substrate to prepare an object to be transferred. After drying, the film thickness was about 5 μm. (Adhesive layer composition)-Diallyl phthalate resin (Dip A: Dap A) ... 10 parts by weight-Polyester resin (Toyobo: Byron 300) ... 3 parts by weight-Benzoguanamine resin (Nippon Shokubai Co., Ltd.) ... 2 parts by weight- Toluene: 40 parts by weight-2-butanone: 40 parts by weight

Next, an intermediate transfer member having a thickness of 100 μm
The following composition was applied to the surface of the polyethylene terephthalate film of Example 1 with an applicator and dried at 100 ° C. to form a release layer. The film thickness after drying is about 1 μm. (Composition of release layer) Vinyl chloride vinyl acetate resin (VAGH, manufactured by Union Carbide Co., Ltd.): 15 parts by weight Polyethylene vinyl acetate resin (manufactured by DuPont Polychemicals, Mitsui; Evaflex 40W): 5 parts by weight, toluene: 80 parts by weight Department

Next, an infrared absorbing layer having the following composition was formed on the release layer by the same method. (Infrared absorbing layer composition)-Polyamide resin (Tomide # 509, manufactured by Fuji Kasei Kogyo Co., Ltd.): 10 parts by weight-Infrared absorbing dye (HR180, manufactured by Mitsui Toatsu Dye Co., Ltd.): 0.3 parts by weight-Toluene ... 45 parts by weight- 2-butanone: 45 parts by weight

Using a commercially available aqueous solution of a delayed tack adhesive, the composition is coated on a film on which the above-mentioned release layer and the infrared absorbing layer are formed with an applicator so as to have a dry film thickness of 10 μm. It was dried to prepare a transfer-receiving body. (Delayed tack adhesive layer) DW2010 (manufactured by Toyo Ink Mfg. Co., Ltd.) 100 parts by weight

Using the same transfer foil as in Example 1, a stripe pattern of three colors was formed on the delayed tack layer of the transfer object by the same image forming method. The irradiation energy of the semiconductor laser light at this time was about 2.5 J / cm ² .

In the same manner as in Example 1, 3
Example 1 was transferred / formed to a transfer target body together with a delayed tack adhesive layer having a color stripe pattern formed thereon.
The same post-baking was performed at 200 ° C. to produce a color filter. At this time, the produced color filter was separated from the coloring of the infrared absorbing layer (this pigment was ocher), as in Example 1, and was transparent and had good display quality.

Further, the material including the infrared absorbing layer, which was transferred to the transfer object, was subjected to post-baking at 200 ° C. in the same manner as in Example 1. However, since the infrared absorbing dye used had good heat resistance, The light absorption of the dye remained, and the light absorption of the dye decomposition product due to heat also occurred, resulting in a color filter with extra coloring and low display quality.

[0063]

According to the present invention, an intermediate transfer member having a release layer, an infrared absorbing layer and a delayed tack adhesive layer sequentially provided on a substrate such as a plastic film is irradiated with an infrared laser beam in a predetermined pattern. A step of forming a pattern-like adhesive portion on the delayed tack adhesive layer by heating from the heated infrared absorbing layer, and then closely contacting / peeling a transfer foil having a colored transfer layer to form a color filter pattern of one color. This is a method of producing a color filter by transferring the red, blue, and green three-colored patterns formed by repeating the above for the required number of colors to a transfer object provided with an adhesive layer on a transparent substrate such as glass. Compared with conventional color filter manufacturing methods such as the pigment dispersion method and dyeing method, it is a manufacturing method that requires fewer steps and has higher productivity, does not require liquid development, and can be easily reduced in cost. Is a method that enables the color filter manufacturing precision.

In the present invention, since the colored transfer foil is manufactured by another coating apparatus, the uniformly coated transfer layer becomes a colored pattern as it is, so that there is no density unevenness.
In addition to being able to obtain a color filter having a thin film and high transparency and high display quality, it is characterized in that transfer foil production is suitable for high-speed coating that enables cost reduction.

Further, in the present invention, since the infrared absorbing layer is left on the intermediate transfer member, it is possible to manufacture a color filter having high display quality without extra coloring.

[Brief description of the drawings]

FIG. 1 is a process chart showing an example of a method for manufacturing a color filter according to the present invention. (A) to (d) indicate the following, respectively. (A) Configuration of the intermediate transfer body (b) When the intermediate transfer body is irradiated with heat rays of laser beam scanning (c) When the transfer foils are overlapped (d) When the transfer foils are peeled

FIG. 2 is a process chart showing an example of a method for manufacturing a color filter according to the present invention. (A) to (c) indicate the following, respectively. (A) Configuration of the transfer object (b) Colored pattern formed on the intermediate transfer body (c) Form where transfer is formed on the transfer object

FIG. 3 is a process chart showing an example of a method for manufacturing a color filter according to the present invention. (A) to (g) show the following, respectively. (A) Configuration of transfer target body having black stripes formed (b) Irradiation of heat rays by laser light scanning on intermediate transfer body (c) Transfer foil of first color superimposed (d) First transfer color When the colored pattern is formed (e) When the second colored pattern is formed (f) When the third colored pattern is formed (g) The three colored patterns formed in (f) are formed on the transfer target. Transferred to

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Adhesion layer 5 ... Transfer receiving body 10 ... Substrate 11 ... Infrared absorption layer 12 ... Release layer 13 ... Delayed tack adhesive layer 14 ... Middle Transfer body 16 ... Support 18 ... Transfer layer 20 ... Transfer foil 22 ... Adhesive part 24 ... Non-adhesive part 28 ... Remaining part 30 ... Peeling part 32 (r , G, b): colored pattern 38: black matrix

Claims (3)

[Claims] 1. An infrared absorbing layer comprising an infrared absorbing dye and a binder resin on a flexible substrate, and a delayed tack adhesive layer comprising a binder resin, a plasticizer and an adhesive. A heat ray exposure step by scanning a laser beam controlled to irradiate heat rays based on data of an image shape to be formed on the intermediate transfer body configured by providing, after the heat ray irradiation, delayed tack adhesion of the intermediate transfer body An adhesive layer and a transfer layer of a transfer foil having a structure in which a transfer layer made of a colorant and a binder resin is provided on a support, and, after the adhesion, the transfer foil is peeled off from the intermediate transfer body. A peeling step, a series of these steps is repeated a plurality of times using transfer foils of different colors to form a colored pattern image of a predetermined shape of a plurality of colors, and thereafter, an adhesive layer made of a binder resin is formed on the transparent substrate. Established A method for producing a color filter, wherein a transfer pattern is formed by transferring a color pattern having a predetermined shape of a plurality of colors onto the transfer target by peeling the transfer target after being press-contacted to the colored pattern image. 2. When transferring a colored pattern image of a plurality of colors from the intermediate transfer member to a transfer target member, the transfer member is separated from an infrared absorbing layer and a delayed tack adhesive layer of the intermediate transfer member, and The method for producing a color filter according to claim 1, wherein both the colored pattern having a predetermined shape of a plurality of colors and the delayed tack adhesive layer are transferred onto the transfer body. 3. A method according to claim 1, wherein a release layer is provided between the infrared absorbing layer and the delayed tack adhesive layer of the intermediate transfer body, and when a plurality of colored pattern images are transferred from the intermediate transfer body to the transferred body, The method for producing a color filter according to claim 1, wherein the color filter is separated from an infrared absorbing layer and a delayed tack adhesive layer of the intermediate transfer member.